Picked up my new outboard yesterday. I bought it from an estate sale. It still had the tags on it and the family said it had never been used. $550 and it was mine.
I put it in the outboard well, follow all directions and pull the cord. Nothing. Pull, pull, pull. Nothing, nothing, nothing. Frustrated, I check the plug. It's good. Next I check the fuel, and this is where it gets interesting. There is no fuel flowing to the fuel pump. I was using the internal tank and it's gravity fed to the pump, no priming needed.
I ended up pulling the fuel tank off and then pulled the fuel line off the diverter valve (internal/external). Fuel flows freely. Next I pull the fuel line off the fuel pump. No gas! Change the diverter to internal, and, voila, fuel starts flowing, and the engine starts on the first pull.
I suspect that the motor had been sitting awhile and a vacuum developed between the diverter valve and the fuel pump, and the gravity feed wasn't enough to compensate.
It's nice to finally have an engine that I can trust...
I have the Tohatsu 6HP, 4 stroke, I think the same basic engine. You didn't mention the fuel selector valve/switch on the right side of the engine. IIRC, without going downstairs, there are small icons showing an external tank & something else which must be in the "something else" position. Also, there is a rubber cap that covers the external tank connection. Make sure it fits on there very tightly to avoid an air leak. Check the tank vent, maybe try starting with the cap off?
I found it is critical to follow the starting instructions exactly, Choke all the way out, throttle on the "start" position only. I had the same experience you had when first starting it. The internal tank takes quite a few hard pulls to finally fire. Make sure you are getting spark before pulling your arm off.
Tohatsu has user manuals on line.
Forgot this. First, I have no way to know what your experience/ knowledge levels are, so, If I am telling you something you already know, my apologies. All this assumes the engine has not been run:
1. My engine was delivered without oil in it. Oil is good, holds about 16 oz, IIRC.
2. Make sure the kill switch lanyard clip is securely pressed on/in to the fitting just below the red kill button. No lanyard clip, no spark.
3. Test for spark by removing the plug, re-install the ignition wire, and tightly holding the base of the plug against a bare metal part of the block. Pull the cord, you should see a bright blue/white spark. The gap should be about .035" or so, IIRC.
4. If the plug is wet/dirty it means too much fuel is probably reaching it.
5. Loosen the drain screw at the very bottom of the carb. Fuel should run out. If not, it is not reaching the float bowl.
6. If it drains, re tighten the drain screw, repeat starting procedure. If no fire, re-drain, new fuel should come out. I don't think it will drain continuously? I think it has to be pumped in there?
7. If you are getting spark & if you are getting continuous fuel to the float bowl, it is possible/probable there was fuel left in the carb over a long period of time, not good. This will require a thorough cleaning of the carb.
8. HOWEVER, before ripping the carb off, you might try taking the intake fitting off the carb & squirting a LITTLE bit of fuel into the carb mouth. You should get at least a pop or two out of the engine. If that happens , before taking the carb off, you might try putting a couple ozs of carb clearer in the tank, run some more fuel through the carb drain, pull it through a few hundred times and let it set for a day or two. Then re-drain & try to start it. If you see any debris at all on the rag you drained into, it is deep doo-doo time, off with the carb.
All this will be much easier if you bring it home, fill up a garbage can & run it there . Suggest you do not run it with no water flowing through, even for just a short time. Let us know how it comes out.